AAON HA-50 - Manual (Page 7)

7
COOLING
1.
Main Power Switches are on and power is to the unit.
2. Set thermostat in cooling mode and place the
"fan" switch to on. Check blower for correct operating
direction, amperage and voltage.
Check compressor(s) operation. Check the amperage
and compare to the nameplate data (check amperage
load side of the compressor contactor).
BLOWER
Inspect blower and blower section to keep free of dust or
debris. To clean the blower, turn the thermostat and the
power to the "OFF" position. Clean the assembly, check
the bearings for looseness, inspect the belt condition and
tightness, check screws for tightness, rotate blower
wheel and inspect for noise or roughness in the bearings.
HEATING • ELECTRIC (IF APPLICABLE)
1.
Set thermostat in the heat mode.
2. Set thermostat to call for heat to engage all
electric heat strips. Check blower for proper rotation
and voltage.
3. Measure the amperage and voltage. Compare
them to the nameplate data.
LUBRICATION
All original blower motors and bearings are furnished
with an orginal factory charge of lubrication. Some
applications will require that bearings be re-lubricated
periodically. The schedule will depend on the operating
duty, temperature variations or other severe atmospheric
conditions.
Bearings should be re-lubricated when at normal oper-
ating temperatures, but not running. Rotate the fan
shaft by hand and add only enough grease to purge the
seals. DO NOT OVERLUBRICATE.
Recommended greases are:
SHELL OIL - DOLIUM R
CHEVRON OIL - SRI No. 2
TEXACO INC. - PREMIUM RB
▲
! WARNING
Electric shock hazard. Can cause injury or death.
Before attempting to perform any service or
maintenance, turn the electrical power to unit to
OFF at disconnect switch(es). Unit may have
multiple power supplies.
SERVICING, TROUBLE SHOOTING, INSPECTIONS & MAINTENANCE
SERVICE
In the event the unit is not functioning correctly and a
service company is required, a company with service
technicians qualified and experienced in electric heat-
ing and air conditioning be permitted to service the
systems in order to keep warranties in effect. The
service tech may call the factory if assistance is required.
BEFORE CALLING, HE SHOULD HAVE THE MODEL
AND SERIAL NUMBER OF THE UNIT AVAILABLE
FOR THE CUSTOMER SERVICE DEPARTMENT TO
HELP ANSWER QUESTIONS REGARDING THE
UNIT.
AAON, Inc.
Phone: 918-583-2266
Fax: 918-382-6364
Customer Service Department
UNIT REPLACEMENT PARTS
Replacement parts for AAON equipment may be ob-
tained from AAON. When ordering parts, always refer-
ence the unit model number, serial number and part
number.
ALWAYS USE AAON SPECIFIED PARTS
COMMON CAUSES OF REDUCED AIR FLOW
A.
DIRTY FILTERS - Filters must be inspected and
replaced on a regular basis. It is strongly recommended
that the media be replaced monthly. Clean filters are
your best insurance against premature system break-
down. Do not permit the unit to be operated unless the
filters are in place. Operation of the unit without filters
will result in a clogged evaporator coil - a very expensive
service job to correct.
B. OBSTRUCTION TO AIR FLOW - Supply and
return air grilles must be kept clear so air can be freely
discharged and drawn from the system.
CLEANING
Inspect unit interior at the beginning of each heating
and cooling season and as operating conditions require.
COILS
Evaporator coil(s) should be inspected and cleaned an-
nually to ensure there is no obstruction to air flow.
Condenser coil(s) should be inspected monthly. Clean
condenser coils annually and as required by location or
outdoor air conditions.
▲
! WARNING
All of the items listed under the service, trouble
shooting, inspections and maintenance section of
this manual should be performed once a year.